This compound, identified as the primary hydrolysis impurity 2 of Azacitidine, is a guanidine derivative of a ribose sugar. Its chemical name is N-[amino-[[3,4-dihydroxy-5-(hydroxymethyl)oxolan-2-yl]carbamoylamino]methylidene]formamide. It is structurally related to the nucleoside analog Azacitidine, a DNA methyltransferase inhibitor used as an antineoplastic agent. Its primary and definitive application is in the pharmaceutical quality control and analytical research of Azacitidine. It serves as a specified impurity reference standard (impurity B) for monitoring and controlling the quality of the active pharmaceutical ingredient (API) during its manufacturing process and stability studies, as per regulatory guidelines from pharmacopoeias like USP and ICH. As a defined degradation product, its characterization and quantification are critical for ensuring the safety, efficacy, and consistency of Azacitidine drug products. It is not used as a general-purpose synthetic building block but is specifically relevant to the development and analysis of this anticancer drug.